//	{
//		outcode(int($1), &$2, 0, &$4);
//	}
	MOVH	foo<>+3(SB), R2
	MOVH	(R20), R7	// 86870000
	MOVH	54(R11), R26	// 857a0036
	MOVH	-42(R3), R20	// 8474ffd6
	MOVHU	(R20), R7	// 96870000
	MOVHU	54(R11), R26	// 957a0036
	MOVHU	-42(R3), R20	// 9474ffd6

//	LMOVB addr ',' rreg
//	{
//		outcode(int($1), &$2, 0, &$4);
//	}
	MOVB	foo<>+3(SB), R2
	MOVB	(R4), R21	// 80950000

	MOVH	R0<<16, R2         // ERROR "illegal shift"
	MOVBS	R0->8, R2          // ERROR "illegal shift"
	MOVHS	R0<<24, R2         // ERROR "illegal shift"
	MOVBU	R0->24, R2         // ERROR "illegal shift"
	MOVHU	R0@>1, R2          // ERROR "illegal shift"
	XTAB	R0>>8, R2          // ERROR "illegal shift"
	XTAH	R0<<16, R2         // ERROR "illegal shift"
	XTABU	R0->24, R2         // ERROR "illegal shift"

	// ppc64le:`MOVHZ\s`,-`MOVBZ`
	// arm64:`MOVHU\s\(R[0-9]+\),`,-`MOVB`
	// s390x:`MOVHBR\s\(.*\),`
	// ppc64:`MOVHBR\s`,-`MOVBZ`
	return binary.LittleEndian.Uint16(b)
}

func load_le16_idx(b []byte, idx int) uint16 {
	// amd64:`MOVWLZX\s\(.*\),`,-`MOVB`,-`OR`
	// ppc64le:`MOVHZ\s`,-`MOVBZ`
	// ppc64:`MOVHBR\s`,-`MOVBZ`
	// arm64:`MOVHU\s\(R[0-9]+\)\(R[0-9]+\),`,-`MOVB`
	// s390x:`MOVHBR\s\(.*\)\(.*\*1\),`

var plan9OpMap = map[Op]string{
	LWARX:     "LWAR",
	LDARX:     "LDAR",
	LHARX:     "LHAR",
	LBARX:     "LBAR",
	LWAX:      "MOVW",
	LHAX:      "MOVH",
	LWAUX:     "MOVWU",
	LHAU:      "MOVHU",
	LHAUX:     "MOVHU",
	LDX:       "MOVD",
	LDUX:      "MOVDU",
	LWZX:      "MOVWZ",
	LWZUX:     "MOVWZU",
	LHZX:      "MOVHZ",
	LHZUX:     "MOVHZU",
	LBZX:      "MOVBZ",
	LBZUX:     "MOVBZU",

	MOVBU (R2)(R8.SXTX), R19                   // 53e86838
	MOVBU (R27)(R23), R14                      // 6e6b7738
	MOVHU.P 107(R14), R13                      // cdb54678
	MOVHU.W 192(R3), R2                        // 620c4c78
	MOVHU 6844(R4), R19                        // 93787579
	MOVHU (R5)(R25.SXTW), R15                  // afc87978
	//TODO MOVBW.P 77(R19), R11                // 6bd6c438

	// wasm:"I64Ctz"
	return bits.TrailingZeros32(n)
}

func TrailingZeros16(n uint16) int {
	// amd64:"BSFL","ORL\\t\\$65536"
	// 386:"BSFL\t"
	// arm:"ORR\t\\$65536","CLZ",-"MOVHU\tR"
	// arm64:"ORR\t\\$65536","RBITW","CLZW",-"MOVHU\tR",-"RBIT\t",-"CLZ\t"
	// s390x:"FLOGR","OR\t\\$65536"
	// ppc64x/power8:"POPCNTD","ORIS\\t\\$1"
	// ppc64x/power9:"CNTTZD","ORIS\\t\\$1"
	// wasm:"I64Ctz"
	return bits.TrailingZeros16(n)

		{name: "MOVHUload", argLength: 2, reg: gpload, aux: "SymOff", asm: "MOVHU", typ: "UInt16", faultOnNilArg0: true, symEffect: "Read"}, // load from arg0 + auxInt + aux.  arg1=mem.

	var src, dst, kind asmKind
	op := m[1]
	switch fn.arch.name + "." + op {
	case "386.FMOVLP":
		src, dst = 8, 4
	case "arm.MOVD":
		src = 8
	case "arm.MOVW":
		src = 4
	case "arm.MOVH", "arm.MOVHU":
		src = 2
	case "arm.MOVB", "arm.MOVBU":
		src = 1
	// LEA* opcodes don't really read the second arg.
	// They just take the address of it.
	case "386.LEAL":
		dst = 4
		addr = true

		{name: "MOVHUload", argLength: 2, reg: gpload, aux: "SymOff", asm: "MOVHU", typ: "UInt16", faultOnNilArg0: true, symEffect: "Read"}, // load from arg0 + auxInt + aux.  arg1=mem.

		{name: "MOVHUload", argLength: 2, reg: gpload, aux: "SymOff", asm: "MOVHU", typ: "UInt16", faultOnNilArg0: true, symEffect: "Read"}, // load from arg0 + auxInt + aux.  arg1=mem.